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Evidence for top quark production in p¯p collisions at √s =1.8 TeV

F. Abe, M. G. Albrow, S. R. Amendolia, D. Amidei, J. Antos, C. Anway-Wiese, G. Apollinari, H. Areti, P. Auchincloss et al.

M. Austern, F. Azfar, P. Azzi, N. Bacchetta, W. Badgett, M. W. Bailey, J. Bao, P. de Barbaro, A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett, P. Bartalini, G. Bauer, T. Baumann, F. Bedeschi, S. Behrends, S. Belforte, G. Bellettini, J. Bellinger, D. Benjamin, J. Benlloch, J. Bensinger, D. Benton, A. Beretvas, J. P. Berge, S. Bertolucci, A. Bhatti, K. Biery, M. Binkley, F. Bird, D. Bisello, R. E. Blair, C. Blocker, A. Bodek, V. Bolognesi, D. Bortoletto, C. Boswell, T. Boulos, G. Brandenburg, E. Buckley-Geer, H. S. Budd, K. Burkett, G. Busetto, A. Byon-Wagner, K. L. Byrum, C. Campagnari, M. Campbell, A. Caner, W. Carithers, D. Carlsmith, A. Castro, Y. Cen, F. Cervelli, J. Chapman, M.-T. Cheng, G. Chiarelli, T. Chikamatsu, S. Cihangir, A. G. Clark, M. Cobal, M. Contreras, J. Conway, J. Cooper, M. Cordelli, D. P. Coupal, D. Crane, J. D. Cunningham, T. Daniels, F. DeJongh, S. Delchamps, S. Dell’Agnello, M. Dell’Orso, L. Demortier, B. Denby, M. Deninno, P. F. Derwent, T. Devlin, M. Dickson, S. Donati, R. B. Drucker, A. Dunn, K. Einsweiler, J. E. Elias, R. Ely, E. Engels, Jr., S. Eno, D. Errede, S. Errede, Q. Fan, B. Farhat, I. Fiori, B. Flaugher, G. W. Foster, M. Franklin, M. Frautschi, J. Freeman, J. Friedman, H. Frisch, A. Fry, T. A. Fuess, Y. Fukui, S. Funaki, G. Gagliardi, S. Galeotti, M. Gallinaro, A. F. Garfinkel, S. Geer, D. W. Gerdes, P. Giannetti, N. Giokaris, P. Giromini, L. Gladney, D. Glenzinski, M. Gold, J. Gonzalez, A. Gordon, A. T. Goshaw, K. Goulianos, H. Grassmann, A. Grewal, G. Grieco, L. Groer, C. Grosso-Pilcher, C. Haber, S. R. Hahn, R. Hamilton, R. Handler, R. M. Hans, K. Hara, B. Harral, R. M. Harris, S. A. Hauger, J. Hauser, C. Hawk, J. Heinrich, D. Hennessy, R. Hollebeek, L. Holloway, A. Hölscher, S. Hong, G. Houk, P. Hu, B. T. Huffman, R. Hughes, P. Hurst, J. Huston, J. Huth, J. Hylen, M. Incagli, J. Incandela, H. Iso, H. Jensen, C. P. Jessop, U. Joshi, R. W. Kadel, E. Kajfasz, T. Kamon, T. Kaneko, D. A. Kardelis, H. Kasha, Y. Kato, L. Keeble, R. D. Kennedy, R. Kephart, P. Kesten, D. Kestenbaum, R. M. Keup, H. Keutelian, F. Keyvan, D. H. Kim, H. S. Kim, S. B. Kim, S. H. Kim, Y. K. Kim, L. Kirsch, P. Koehn, K. Kondo, J. Konigsberg, S. Kopp, K. Kordas, W. Koska, E. Kovacs, W. Kowald, M. Krasberg, J. Kroll, M. Kruse, S. E. Kuhlmann, E. Kuns, A. T. Laasanen, S. Lammel, J. I. Lamoureux, T. LeCompte, S. Leone, J. D. Lewis, P. Limon, M. Lindgren, T. M. Liss, N. Lockyer, O. Long, M. Loreti, E. H. Low, J. Lu, D. Lucchesi, C. B. Luchini, P. Lukens, J. Lys, P. Maas, K. Maeshima, A. Maghakian, P. Maksimovic, M. Mangano, J. Mansour, M. Mariotti, J. P. Marriner, A. Martin, J. A. J. Matthews, R. Mattingly, P. McIntyre, P. Melese, A. Menzione, E. Meschi, G. Michail, S. Mikamo, M. Miller, R. Miller, T. Mimashi, S. Miscetti, M. Mishina, H. Mitsushio, S. Miyashita, Y. Morita, S. Moulding, J. Mueller, A. Mukherjee, T. Muller, P. Musgrave, L. F. Nakae, I. Nakano, C. Nelson, D. Neuberger, C. Newman-Holmes, L. Nodulman, S. Ogawa, S. H. Oh, K. E. Ohl, R. Oishi, T. Okusawa, C. Pagliarone, R. Paoletti, V. Papadimitriou, S. Park, J. Patrick, G. Pauletta, M. Paulini, L. Pescara, M. D. Peters, T. J. Phillips, G. Piacentino, M. Pillai, R. Plunkett, L. Pondrom, N. Produit, J. Proudfoot, F. Ptohos, G. Punzi, K. Ragan, F. Rimondi, L. Ristori, M. Roach-Bellino, W. J. Robertson, T. Rodrigo, J. Romano, L. Rosenson, W. K. Sakumoto, D. Saltzberg, A. Sansoni, V. Scarpine, A. Schindler, P. Schlabach, E. E. Schmidt, M. P. Schmidt, O. Schneider, G. F. Sciacca, A. Scribano, S. Segler, S. Seidel, Y. Seiya, G. Sganos, A. Sgolacchia, M. Shapiro, N. M. Shaw, Q. Shen, P. F. Shepard, M. Shimojima, M. Shochet, J. Siegrist, A. Sill, P. Sinervo, P. Singh, J. Skarha, K. Sliwa, D. A. Smith, F. D. Snider, L. Song, T. Song, J. Spalding, L. Spiegel, P. Sphicas, A. Spies, L. Stanco, J. Steele, A. Stefanini, K. Strahl, J. Strait, D. Stuart, G. Sullivan, K. Sumorok, R. L. Swartz, Jr., T. Takahashi, K. Takikawa, F. Tartarelli, W. Taylor, Y. Teramoto, S. Tether, D. Theriot, J. Thomas, T. L. Thomas, R. Thun, M. Timko, P. Tipton, A. Titov, S. Tkaczyk, K. Tollefson, A. Tollestrup, J. Tonnison, J. F. de Troconiz, J. Tseng, M. Turcotte, N. Turini, N. Uemura, F. Ukegawa, G. Unal, S. van den Brink, S. Vejcik, III, R. Vidal, M. Vondracek, R. G. Wagner, R. L. Wagner, N. Wainer, R. C. Walker, G. Wang, J. Wang, M. J. Wang, Q. F. Wang, A. Warburton, G. Watts, T. Watts, R. Webb, C. Wendt, H. Wenzel, W. C. Wester, III, T. Westhusing, A. B. Wicklund, R. Wilkinson, H. H. Williams, P. Wilson, B. L. Winer, J. Wolinski, D. Y. Wu, X. Wu, J. Wyss, A. Yagil, W. Yao, K. Yasuoka, Y. Ye, G. P. Yeh, P. Yeh, M. Yin, J. Yoh, T. Yoshida, D. Yovanovitch, I. Yu, J. C. Yun, A. Zanetti, F. Zetti, L. Zhang, S. Zhang, W. Zhang, and S. Zucchelli

  • Argonne National Laboratory, Argonne, Illinois 60439
  • Brandeis University, Waltham, Massachusetts 02254
  • Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40126 Bologna, Italy
  • University of California at Los Angeles, Los Angeles, California 90024
  • University of Chicago, Chicago, Illinois 60637
  • Duke University, Durham, North Carolina 27708
  • Fermi National Accelerator Laboratory, Batavia, Illinois 60510
  • Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
  • Harvard University, Cambridge, Massachusetts 02138
  • University of Illinois, Urbana, Illinois 61801
  • Institute of Particle Physics, McGill University, Montreal, Quebec, Canada H3A 2T8
  • University of Toronto, Toronto, Ontario, Canada M5S 1A7
  • The Johns Hopkins University, Baltimore, Maryland 21218
  • National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305, Japan
  • Lawrence Berkeley Laboratory, Berkeley, California 94720
  • Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
  • University of Michigan, Ann Arbor, Michigan 48109
  • Michigan State University, East Lansing, Michigan 48824
  • University of New Mexico, Albuquerque, New Mexico 87131
  • Osaka City University, Osaka 588, Japan
  • Universita di Padova, Instituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
  • University of Pennsylvania, Philadelphia, Pennsylvania 19104
  • University of Pittsburgh, Pittsburgh, Pennsylvania 15260
  • Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
  • Purdue University, West Lafayette, Indiana 47907
  • University of Rochester, Rochester, New York 14627
  • Rockefeller University, New York, New York 10021
  • Rutgers University, Piscataway, New Jersey 08854
  • Academia Sinica, Taiwan 11529, Republic of China
  • Superconducting Super Collider Laboratory, Dallas, Texas 75237
  • Texas A&M University, College Station, Texas 77843
  • University of Tsukuba, Tsukuba, Ibaraki 305, Japan
  • Tufts University, Medford, Massachusetts 02155
  • University of Wisconsin, Madison, Wisconsin 53706
  • Yale University, New Haven, Connecticut 06511

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Phys. Rev. D 50, 2966 – Published 1 September, 1994

DOI: https://doi.org/10.1103/PhysRevD.50.2966

Abstract

We present the results of a search for the top quark in 19.3 pb−1 of p¯p collisions at √s =1.8 TeV. The data were collected at the Fermilab Tevatron collider using the Collider Detector at Fermilab (CDF). The search includes standard model tt¯ decays to final states eeνν¯, eμνν¯, and μμνν¯ as well as e+ν+jets or μ+ν+jets. In the (e,μ)+ν+jets channel we search for b quarks from t decays via secondary vertex identification and via semileptonic decays of the b and cascade c quarks. In the dilepton final states we find two events with a background of 0.56−0.13+0.25 events. In the e,μ+ν+jets channel with a b identified via a secondary vertex, we find six events with a background of 2.3±0.3. With a b identified via a semileptonic decay, we find seven events with a background of 3.1±0.3. The secondary vertex and semileptonic-decay samples have three events in common. The probability that the observed yield is consistent with the background is estimated to be 0.26%. The statistics are too limited to firmly establish the existence of the top quark; however, a natural interpretation of the excess is that it is due to tt¯ production. We present several cross-checks. Some support this hypothesis; others do not. Under the assumption that the excess yield over background is due to tt¯, constrained fitting on a subset of the events yields a mass of 174±10−12+13 GeV/c2 for the top quark. The tt¯ cross section, using this top quark mass to compute the acceptance, is measured to be 13.9−4.8+6.1 pb.

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Phys. Rev. D 50, 2966– Published 1 September, 1994
  • Received 25 April 1994

© 1994 American Physical Society

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